Nonlinear Instability Mechanism in 3D Collisional Drift-Wave Turbulence.
Nonlinear Instability Mechanism in 3D Collisional Drift-Wave Turbulence.
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3D 碰撞漂移波湍流中的非线性不稳定机制。
DOI：
10.1103/physrevlett.74.706
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发表时间：
1995
影响因子：
8.6
通讯作者：
Zeiler
中科院分区：
文献类型：
--
作者：
Biskamp;Zeiler
三维碰撞漂移波湍流的数值模拟揭示了一个基本上不同于以往的二维研究中发现的行为。由于能量转移到小[ital k][sub [ital z]]导致对流单元的形成，线性不稳定性饱和。湍流由[ital k][sub [ital z]]=0和[ital k][sub [ital z]][ne]0模式之间的非线性传递过程维持，后者充当催化剂。系统趋向于松弛为非湍流极向剪切流。
Numerical simulations of 3D collisional drift-wave turbulence reveal a behavior basically different from that found in previous 2D studies. The linear instability saturates due to energy transfer to small [ital k][sub [ital z]] leading to the formation of convective cells. The turbulence is sustained by nonlinear transfer processes between [ital k][sub [ital z]]=0 and [ital k][sub [ital z]][ne]0 modes, the latter acting as a catalyst. The system tends to relax to a nonturbulent poloidal shear flow.